I found that when the intake air sensor was fitted to the filter backplate, the sensor gained a lot of heat from the engine and read high.
As a solution I fitted an air temp sensor with an exposed element and fitted it away from the aluminium back plate. I fixed the sensor in the side of the airbox and will monitor the performance.
I replaced the plastic plate on the airbox for an aluminium plate. I manufactured the plate and powder coated black, then mixed with rivets and tiger seal.